A control valve is used to control the flow of the fluid. It works on the principle of varying the flow passage size as per the direction received from the controller signal. Valves are majorly used in the process plants. They are known to play a huge role in reducing the financial cost. However, it also increases the process plant’s profitability and, at the same time, being energy conservative.
Understanding the Control Valve
One shall study the detailed account of the fluid and system properties. The identification process is an important step before the selection of an appropriate control valve for the project. So, one must understand the relationship between the valve and its requirements. As the valve is power-operated, constant monitoring of its power loss is necessary. The engineer must be alert and responsive to the valve’s reaction.
Extra noise earns a negative point for the valve. Control valves may produce noise depending on the cavitation, aerodynamic effects, and mechanical vibrations. The noise generated is generally below 100dB. However, aerodynamic effects leading to noise can cross 100dB. Thus one should keep in mind the noise restrictions, and the information on our website will help in a better understanding.
3. Flow characteristic Selection
Flow characteristic has an impact on the selection. This gets divided in equal percentages with a quick opening. When the constant flow is needed, a quick opening is required for frequent on-off service. An equal percentage is required in cases where the pressure drop across the valve is expected to remain constant.
4. Materials of construction
Materials are an important factor, along with preferences and costs. Using nickel or cobalt-chromium alloys can help in reducing erosion. Valves also require insulation, so that they can withstand high pressure in certain cases.
Maintenance is an important point, as its cost can add to the project budget. A poorly suited valve may require more maintenance than the perfect match.
While considering a control valve for a project, one should consider several parameters. The Dead time lag, gain, and time constant in the control valve form the base to determine the control valve. Moreover, these factors help to differentiate and check the worth of the valve. It is always better to make an informed choice and thus head into our website for help.